Nickel-Tungsten Composite-Like Microstructures Processed by Spark Plasma Sintering for Structural Applications

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

“…Trace amounts of tungsten carbides observed are conditioned by the carbon uptake during sintering due to the tungsten’s affinity to carbon at the sintering temperature; as powders were consolidated in graphite dies, graphite punches and protective graphite foil were also utilized. Vickers microhardness was measured to be 5.8 ± 0.6 GPa (HV1), which is comparable (or even higher) with results reported elsewhere [ 27 , 28 , 29 ] for the Ni-W alloys (4.5–5.5 GPa). The increased microhardness value is solely conditioned by an increased W amount in the Ni lattice structure.…”

Ultrafine-Grained Two-Phase High-Entropy Alloy Microstructures Obtained via Recrystallization: Mechanical Properties

“…Moreover, residual crystallographic texture resulting from the SPD-like step may also impact the subsequent mechanical behavior. It has to be noticed that the beneficial effect on improving ductility and toughness by recourse of bimodal grain size distributions has also been reported by Fan et al (2006), Witkin et al (2003), Billard et al (2006), Langlois et al (2019), Tingaud et al (2019), Flipon et al (2020), and García de la Cruz et al (2020). A further step in optimizing the synergy between tensile strength and ductility has been introduced via the concept of harmonic structure design by Ameyama and Fujiwara (2012), Ota et al (2014), Vajpai et al (2016.…”

Numerical modeling on strengthening mechanisms of the harmonic structured design on CP-Ti and Ti–6Al–4V

“…To overcome the disadvantage of homogeneous FG/UFG materials, many researchers have attempted to propose approaches to construct heterogeneous microstructures, which exhibit high strength and proper ductility (Kang et al, 2016;Lu et al, 2014;Fang et al, 2011;Ma and Zhu, 2017;Tingaud et al, 2019;Langlois et al, 2019). Among those works, Ameyama and coworkers proposed a new microstructure called 'harmonic structure' (HS) (Fujiwara et al, 2010;Orlov et al, 2013).…”